Valve device for bleed opening



April 9, 1935.

Ga'zfaon P1315 we? pa eewts 5,. ,1,99- ,3 t

UNITED STATES'VPATENTTOF'FIQET" Clifton P. HoWard WorceSter, Mass.,assignor to 1 i Rockwood Sprinkler Company of Massachusetts, acorporation of Massachusetts I Application March 4,1931, Serial No.520.075

' 1 Claim. (01. 251-120) This. invention relates to a device to be usedgeneral purposes and may be used Wherever a where ali'mited equalizingfiow of air or other restricted fiow of air or other fluid is desired.

fluid is desired or otherwise stated, the inven- My improved valvedevice comprises a casing tion relates to'a device in which the valve isatall 10 .having a sleeve portion H threaded both in times open to apredetermined limited extent. ternally and externally and extendingupward 5 It is the object of my invention to provide a through a centralopening in the diaphragm D. construction in which a constant valveopening of A collar or nut I2 threaded on the outside'of the very slightcross section is obtained without resleeve ll clamps the casing Illfirmly against the course to the use of a bleed opening of minutediaphragm D. i

1 diameter. The casing I0 is recessed to receive a valve seat A furtherobject of the invention is to provide -member'20 and is provided with anair'passage a construction in which a secondary restriction 2| in itslower portion. A cap 24 is threaded into of flow is provided. I alsoprovide meansby the sleeve H and firmly secures the valve seat whichgreatly increased flow of air or other fluid member 20 in position. A inthe reverse direction is permitted. A valve 30 is loosely mountedbetween the valve Y My invention further relates to arrangementsseatmember 26 and the cap 24 and is capable of and combinations of partswhich Will be hereinlimited upward movement between these retainafterdescribed and more particularly pointed ing parts. v out in the appendedclaim. The valve seat member 28 has a central opening A preferred formof the invention is shown in 32,.surrounded by a valve seat 33 which ispreferthe drawing, in which ably substantially V-shaped in crosssection. The

Fig. 1 is a sectional side elevation (if my im lower portion of thevalvelseat member 20 is reprovedvalve device; cessed to receive a screen34,to prevent dirt or Fig. 2 is an enlarged sectional detail of theother foreign matter from entering the opening valve seat member; 32.The upper portion of the cap 24 is similarly Fig. 3 is an enlargedsectional detail of the recessed to receive a second screen 35 providedvalve cap; i for the same purpose.

Fig. 4 is an enlarged side elevation of the valve, The ap 24 h s a n lpe 36 s ly su and v I rounding the stem 38 of the valve 30. A stud orFig. 5 is a sectional View of the valve seat, taken projection 40extendsdownward from the valve 36 along the line 5-5 in Fig. 2 butshowing a slight and the lower portion of the stud 40 is downwardlymodification. e and outwardly tapered as indicated at 4!.

Referring to the drawing, I have shown my im- A disc 42 may be providedat the upper end of 7 proved valve device mounted in a central openthevalve stem 38 to prevent displacement of the ing in a diaphragm Dextending across the lower valve member 30 fromthe cap 24 when the capside of an air chamber C, such as the air chamber 24 is removed. forminga component part of a dry pipe ex- When the parts are assembled and innormal hauster. 7 position, the valve. 30 rests on the V-shaped In theoperation of such exhausters, the air valve seat 33, and the cylindricaldownwardly chamber C, as well as the air space s below the pr j tin p rtn 0 f the valve 30 xtends int diaphragm D, are filled with air atrelatively high the opening 32 of the valve seat member 20. Thepressure. When asprinkler opens in the dry pipe stud 40 is smaller thanthe opening 32, so that line, the air pressure in the space S falls, butan annularspace of the desired restricted cross the fiow of air from thechamber C to the space section is provided between the stud and the sidebetween theJchamberC and the space S, and 3 The space between the valvestem 38 and the consequently anexcess of air pressure is developed SideWa l of t p nin 36 the p 24 s babove the diaphragm D, causing thediaphragm stantially greater than the opening between; the

- to be depressed, which action indirectly effects stud lll and the sidewallof the opening 32 the Q the opening of the exhaust valve.

My invention relates specifically to improvefor restriction of air flow.I

ments in the construction of the valve device The fiow of air is alsostill furtherrestricted i shown as regulating the flow of air or leakagebythe seating ofthe valve, 30 on the valve seat between the chamber 0and the space S, but it 32. It is found that when these parts are mawillbe understood that the device is adapted for chined but not lapped, theywill seat .unevenly 05 S is retarded by the very small leakage openingWall of the opening 32. l 45 stem 38 beingused merely for guidance andnot 5 leakage between the valve and the valve seat is desired, a notch50 (Fig. 5) may be cut at one or 7 more points in the valve seat 33. g

It will thus appearthat I have secured an air leakage of a desiredrestriction Without the use of minute perforations, which are readilyclogged by small particles of dust or dirt. 7

When the chamber 0 is being filled and the pressure in the space Sexceeds thepressure in the chamber 0, pressure of air against the underside of the valve 35 will lift the valve from its seat, a 15 thus movingthe tapered portion 4| of the stud 50 into the openingti and providingan annular opening of increased area so thatthe chamber 0 may be quicklyfilled, The fact that the valve 39 "and stud "iii are movable relativeto the valve seat 33 and opening 32 greatly reduces the probability ofclogging the bleed opening, as any lifting of the valve tends toclearthe opening 32 of any dust or dirt which might be accumulating inor 'around the opening.

Having thus described my invention and the advantages thereof, I do notwish to be limited to the details herein disclosed,. otherwise than asset forth in the'claim, but what Iclaim is:

A valve device for a bleed opening comprising asupport having a valveseatwith a relatively small circular central opening therethrough and amember seated thereon by gravity and having a stud slidable in saidcircular opening and thereby providing a restricted annular leakagespace of predetermined and very small cross sectional area, thedifference in diameter between said stud and said circular opening beingapproximately two thousandths of an inch and the total" cross sectionalarea of said opening being approximately two ten-thousandths of a squareinch, said difference in diameter and said total cross sectional areabeing so extremely small that air flow through said annular leakagespace is very greatly retardedand is extremely slow, said member openingupward on excess of air pressure below said device, and the air abovesaid device having continuous access to the restricted annular spacebetween the Wall of said opening and said stud;

CLIFTON P. HOWARD.

